5.3 C: Tuning
5
YASKAWA ELECTRIC
SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
161
Switching Accel/Decel Times by a Frequency Level
The drive can switch between different acceleration and deceleration times automatically. The drive will switch from
accel/decel time 2 in C1-03 and C1-04 to the default accel/decel time in C1-01 and C1-02 when the output frequency
exceeds the frequency level set in parameter C1-11. When it falls below this level, the accel/decel times are switched
back.
shows an operation example.
Note: Acceleration and deceleration times selected by digital inputs have priority over the automatic switching by the frequency level
set to C1-11. For example, if accel/decel time 2 is selected, the drive will use this time only and not switch from accel/decel time
2 to the selected one.
Figure 5.20
Figure 5.20 Accel/Decel Time Switching Frequency
■
C1-11: Accel/Decel Time Switching Frequency
Sets the frequency at which the drive switches between accel/decel time settings.
Refer to Switching Accel/Decel Times
by a Frequency Level on page 161
.
Note: Setting C1-11 to 0.0 Hz disables this function.
■
C1-09: Fast Stop Time
Parameter C1-09 will set a special deceleration that is used when certain faults occur or that can be operated by closing a
digital input configured as H1-
= 15 (N.O. input) or 17 (N.C. input). The input does not have to be closed
continuously, even a momentary closure will trigger the Fast Stop operation. Unlike standard deceleration, once the Fast
Stop operation is initiated, the drive cannot be restarted until the deceleration is complete, the Fast Stop input is cleared,
and the Run command is cycled.
A digital output programmed for “During Fast Stop” (H2-
= 4C) will be closed as long as Fast Stop is active.
A Fast Stop can be selected as the action the drive should take when certain faults occur, such as L8-03 (Overheat Pre-
Alarm Operation Selection).
NOTICE: Rapid deceleration can trigger an overvoltage fault. When faulted, the drive output shuts off, and the motor coasts. To avoid
this uncontrolled motor state and to ensure that the motor stops quickly and safely, set an appropriate Fast Stop time to C1-09.
No.
Parameter Name
Setting Range
Default
C1-11
Accel/Decel Time Switching Frequency
0.0 to 200.0 Hz
0.0 Hz
No.
Parameter Name
Setting Range
Default
C1-09
Fast Stop Time
0.0 to 6000.0 s
10.0 s
Output Frequency
C1-11
Accel/Decel Time
Switch Frequency
C1-03
setting
When the output frequency ≥ C1-11, drive uses Accel/Decel Time 1 (C1-01, -02)
When the output frequency < C1-11, drive uses Accel/Decel Time 2 (C1-03, -04)
C1-01
setting
C1-02
setting
C1-04
setting
SIEP_C710616_35.book 161 ページ 2015年11月30日 月曜日 午後2時2分